Init V4 community edition (#2265)

* Init V4 community edition

* Init V4 community edition

pkg/boolset/boolset.go

@@ -0,0 +1,86 @@
+package boolset
+
+import (
+	"database/sql/driver"
+	"encoding/base64"
+	"errors"
+	"golang.org/x/exp/constraints"
+)
+
+var (
+	ErrValueNotSupported = errors.New("value not supported")
+)
+
+type BooleanSet []byte
+
+// FromString convert from base64 encoded boolset.
+func FromString(data string) (*BooleanSet, error) {
+	raw, err := base64.StdEncoding.DecodeString(data)
+	if err != nil {
+		return nil, err
+	}
+
+	b := BooleanSet(raw)
+	return &b, nil
+}
+
+func (b *BooleanSet) UnmarshalBinary(data []byte) error {
+	*b = make(BooleanSet, len(data))
+	copy(*b, data)
+	return nil
+}
+
+func (b *BooleanSet) MarshalBinary() (data []byte, err error) {
+	return *b, nil
+}
+
+func (b *BooleanSet) String() (data string, err error) {
+	raw, err := b.MarshalBinary()
+	if err != nil {
+		return "", err
+	}
+
+	return base64.StdEncoding.EncodeToString(raw), nil
+}
+
+func (b *BooleanSet) Enabled(flag int) bool {
+	if flag >= len(*b)*8 {
+		return false
+	}
+
+	return (*b)[flag/8]&(1<<uint(flag%8)) != 0
+}
+
+// Value implements the driver.Valuer method.
+func (b *BooleanSet) Value() (driver.Value, error) {
+	return b.MarshalBinary()
+}
+
+// Scan implements the sql.Scanner method.
+func (b *BooleanSet) Scan(src any) error {
+	srcByte, ok := src.([]byte)
+	if !ok {
+		return ErrValueNotSupported
+	}
+	return b.UnmarshalBinary(srcByte)
+}
+
+// Sets set BooleanSet values in batch.
+func Sets[T constraints.Integer](val map[T]bool, bs *BooleanSet) {
+	for flag, v := range val {
+		Set(flag, v, bs)
+	}
+}
+
+// Set sets a BooleanSet value.
+func Set[T constraints.Integer](flag T, enabled bool, bs *BooleanSet) {
+	if len(*bs) < int(flag/8)+1 {
+		*bs = append(*bs, make([]byte, int(flag/8)+1-len(*bs))...)
+	}
+
+	if enabled {
+		(*bs)[flag/8] |= 1 << uint(flag%8)
+	} else {
+		(*bs)[flag/8] &= ^(1 << uint(flag%8))
+	}
+}